Compensator or resistance for press parts



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Sept. 1

Sept. l, 1925.

l. lPATRICK COMPENSATOR OR RESISTANCE -FOR PRESS. PARTS Filed Aug. l, 1924 INVENTOR z Attorneys,

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80 limits' available.

35 ten feet long,

come (wholly or to a 50 spring to another.

Patented Sept. 1, 1925,

"UNITED sTATEs PATENT oFE'lcE.

Isaac miraron, or NEW Yoan,4 N. Y., AssIGNoa To n W. BLISS COMPANY, NEW

Yoax, N. Y., .a conrourroN or WEST momia.

conrENsaroa 'on' RESISTANCE ron rases raars.

. 4Application med August '1, 19.24. 'serial No. 729,082.

To all whom t may concem-f Be it known that I, IsAno PATRICK, a c`1 t1v zen of the United States of America, re'sldino in the boroughof Queens, city land State I ofcew York, have invented certain new and useful Improvements in Compensators or Resistances for Press Parts, of which the following is a specification'.

This invention relates to power presses l and analogous machines in which it is required to compensate the weight (or other thrust) of a moving art, and in whlch 1t 1s desirable to restrict t e .compensating means within limited dimensions.

The Ainvention is particularly adapted to power presses Ahaving a vertically-reciprocat- V ing member, such as a press headtpunch slide, or lblank-holder slide. In some presses it is possible to wholly or partially counterbalance such reciprocatingmember by another reciprocating member the weight of whichconstitutes a sulciently efective comfor rapidly-acting pressesl pensator, but l A where it is desirable to m1n1m1ze the movlng masses, it is preferable to employ compensating springs,` The diicult in the use of such springs has been that t vey re uire to be made of considerable length, an commonly ,reach .dimensions which exceed the vertical Experience shows it to be good mechanical practice to make the spring of a length app ximately twelve times the maximum compression, which, fora stroke of'say ten inches, requires a spring of about which 1n many cases would extend the press to a prohibitive height. The present'invention provides for such s ring-k compensating means as will material y reduce the vertical dimension `required 40 therefor.

According to the present invention the 4compensating means comprises a plurality of springs of equal or approximately similar resilience arranged parallel' so as to substantial extent) within the same vertical dimensions, and connected serially from bottom to top, `so that the thrust due to the compensated weight is transmitted serially from' one Preferably the springs are o equal or nearly equal resilience, and for greater compactnessl these springs are referabl nested one 'within the other. referaby the springs act by compression,

esired to compensate.

nearly so as is pair of spring compensators partly in vertical transverse section,

and'the other in elevation' Figs -4 `and 5 show the lnvention as applled to a spring-.supported slide or table, `or

yieldin bed, F1g. 4 bemg an Ielevation partly roken away in vertical section, and

1% 5a transverse section on the line 5- 5 1n 1 4.

Re erring. first to Figs. 1, 2, and 3, A designates any suitable framework, such construction of fixed as are commonly provided 1n power presses, and comprising a base a,

upright side or endl frames b, b,'and a top Aframe or crown c. B is a vertically-movable slide or head, the weight of which it is decompensating means. essentiallyof springs D and F, with an intervening connecting means E whereby to transmit the thrust other. Thes rings D and F are nested one within the' other, as s are referably own, and preferably of equal resilience, or as practicable, in order that under a. given stress they shall yield equally. The respective springs may, 1f desired, be made each of twp or more sections connecting through intervening rings d, e, thisbe.- ing a convenient construction, but not essential. The springs are shown as compression springs, one of them reacting against any fixed abutment, andthe other reacting di` rectly'or indirectly against the slide B. In the specific construction shown, the outer springs'F are seated on fixed abutments f, f, connected in any suitable manner to 'the crown c or any other convenient for example, by suspension rods g, g, hung by nuts g' from a head h mounted on the crown c. The opposite ends .fof the inner springs .D against movable'plates i connected in any suitable manner to the from one' spring to l anpart, as,

(l is, as a whole, the

This means conslsts les,

" The s rings the springs,

spring bed may be considerable descendingmovement,

slide B, as, for example, by means of tie rods j, j. Other connecting means may be substituted. I

The intervening connector E between the springs of each pair is shown as comprising a tubular ortion c having at itspupper end an outwar ange Z overlying the top of the spring F, and at its lower end an inward flange m underlying the bottom of the inner spring D. The iange m is shown as inturned and reinforced; the,upper flange Z is shown as united to the tubular portion by a screwthread; other details o f construction may, however, be substituted.I

In Figs- 1 to 3, inclusive, the slide B is shown in its upper position; as it' descends, it pulls down the plates i and compresses so that the portion of each spring shown as projecting beyond the other is approximately taken up, so that at maximum .compression the inner and outer springs occupy substantially the same vertical dimension.` Thus a high degree of vertical compactness is attained. The clearance between the springs and the intervening tubular connecting portion k should be suiii-l cient to avoid any sliding contact, Ibut if necessary the portion ls may be lubricated and caused to serve as a guide for keeping the springs in longitudinal alignment.

Figs. 4 and 5 show a modified and somewhat simpler construction. Here the member A is a fixed bed from which is hung by tie rods n, fn, a fixed yoke A2 Jforming an abutment against which the outer springs react. The part to be subjected to spring stress is a slide or movable bed B which is movable within the enclosing base A', and which rests directly on the upper ends of the inner springs D, D The slide B may form a resistant support pressed-slide B by any suitable connections,

-such as by movable pins H, H, Gpassing freely through holes in the plate Any desired initial stress may be given to the sprin in the uppermost position of the slide by drawing up the abutment frame A by nuts p, p. The intervening spring connector E, as here shown, is of essentially 'the same. construction previously describe D, F, are each single springs, .instea of being made up of two or more sections. The operation is essentially the same as before described. The s rings E, F, are shown in Fig.L 5 as arrange in pairs,

and in Fig. 4 is shown a multiple arrangement of four pairs giving'eight compound springs. By this means anextremely stiff rovided, capable of a while its K ing one connection from one end of the inner spring for a die which yields downwardly during the stroke.

means therefor comprising Lacasse overlap in direction of stress and connectedto transmit thrust serially from one to the y other.

2. In a power press having a reciprocating member, a compensating means therefor comprising a plurality of springs of similar resilience arranged parallel within similar dimensions, and an intervening connection extending parallel to the springs for transmitting thrust serially at all times from one to the other.

3. In a power press ing member, a compensating means therefor comprising springs of similar resilience nesting one within the other and connected to transmit thrust `serially from. one to the other. l l

4. In a power press having a reciprocating member, a compensating means therefor comprising springs of similar resilience'nestwithin the other, and an intervening having a reciprocatto the opposite end of the outer spring withing the space between the nested springs.

5. In a power press having a reciprocating member, comprising springs of similar resilience nesting one within the other, and an intervening connection between said springs formed as a tube enclosing the inner spring and within the outer spring, anges abutting the ends of the respective sprin 6. n a. power press having a verticallyreciprocating member, a compensating a plurality of springs arranged parallel within similar vertical dimensions, and having a parallel intervening connection for transmitting thrust serially from one to the other, a fixed abutment against which one spring reacts, and a movable abutment receiving the thrust of the other spring, and a tie member con' necting the latter to said reciprocating member of the press.

In witness whereof I have hereunto signed my name.

ISAAC PATRICK.

a compensating means therefor and having end 

